Kenmore 148.16156210 Use & Care Manual page 33

Adjust valve control screw
,
Pull all the knobs off of valve stems. Adjust
the screw in the valve hole using the
flathead screwdriver. Turn screws two
complete turns counterclockwise.
(Fig. 13)
Valve hole
Fig. 13
2. Press all the knobs back onto valve stems.
3. After all the conversions are complete, return heat diffusers to firebox, followed by the grates and warming
rack.
33